Manufacturing method of polyester for plastic wrap

Abstract

A manufacturing method of a polyester for a plastic wrap at least includes the following steps. An aromatic carboxylic acid, an aliphatic carboxylic acid, and an aliphatic alcohol are provided, wherein the aromatic carboxylic acid includes at least two of a phthalic acid, an isophthalic acid, and a terephthalic acid. The aromatic carboxylic acid, the aliphatic carboxylic acid and the aliphatic alcohol are subjected to at least an esterification reaction, a pre-polymerization reaction, and a polymerization reaction in sequence, so as to obtain a polybutylene adipate terephthalate.

What is claimed is: 
     
       1. A manufacturing method of a polyester for a plastic wrap, comprising:
 providing an aromatic carboxylic acid, an aliphatic carboxylic acid and an aliphatic alcohol, wherein the aromatic carboxylic acid comprises at least two from the group consisting of a phthalic acid, an isophthalic acid, and a terephthalic acid; and 
 obtaining a polybutylene adipate terephthalate by subjecting the aromatic carboxylic acid, the aliphatic carboxylic acid, and the aliphatic alcohol to at least an esterification reaction, a pre-polymerization reaction and a polymerization reaction in sequence, 
 wherein in the polybutylene adipate terephthalate, a ratio of a number of moles of the aromatic carboxylic acid to a number of moles of the aliphatic carboxylic acid ranges from 0.55:0.45 to 0.2:0.8, and the polybutylene adipate terephthalate accounts for more than 95 wt % of the plastic wrap. 
 
     
     
       2. The manufacturing method of  claim 1 , wherein the aliphatic carboxylic acid comprises one or more of a C4-C10 dicarboxylic acid. 
     
     
       3. The manufacturing method of  claim 1 , wherein the aliphatic alcohol comprises one or more of a C4-C12 diol. 
     
     
       4. The manufacturing method of  claim 1 , wherein in the aromatic carboxylic acid, a ratio of a total number of moles of the phthalic acid and the isophthalic acid to a number of moles of the terephthalic acid ranges from 0.01:0.99 to 0.5:0.5. 
     
     
       5. The manufacturing method of  claim 1 , wherein in the aromatic carboxylic acid, a ratio of a number of moles of the phthalic acid to a number of moles of the isophthalic acid ranges from 0:1 to 1:0. 
     
     
       6. The manufacturing method of  claim 1 , wherein in the polybutylene adipate terephthalate, a ratio of a total number of moles of the aromatic carboxylic acid and the aliphatic carboxylic acid to a number of moles of the aliphatic alcohol ranges from 45:55 to 55:45. 
     
     
       7. The manufacturing method of  claim 1 , wherein the aromatic carboxylic acid has a first added amount. the aliphatic carboxylic acid has a second added amount, and a ratio of the second added amount to a sum of the first added amount and the second added amount ranges from 45 mol % to 80 mol %.